You would use the law of cosines
Hi,
For this question, your answer would 40%.
All you had to was divide 160 by 400.
The angle of exactly 90 degrees is called Right angle.
The between 90 and 180 degrees is called Obtuse angle.
The angle less than 90 is called Acute angle.
Finally, the angle between 180 and 360 is called Reflex angle.
